Newly unsealed court documents show that the FBI’s request of Apple in the San Bernardino case is probably not a one-off.

One of Apple’s key arguments in its battle with the government is that if it creates a “back door” to San Bernardino shooter Syed Farook’s iPhone, as the FBI has demanded, it would only lead to more requests from law enforcement to do so on other iPhones in all kinds of cases.

Apple said it’s received requests to unlock multiple models of iPhones to uncover evidence in criminal cases in California, Illinois, Massachusetts, and New York.

The documents were unsealed by U.S. Magistrate Judge James Orenstein, who has expressed doubts in the past that the government is right in relying on the over-200-year-old All Writs Act to issue “back door” requests to device makers and wireless companies.

Back in 1977, the Supreme Court ruled in U.S. v. New York Telephone that federal courts can rely on the All Writs Act in some cases to compel private companies to help the government in the “proper administration of justice.”

The documents were unsealed right in the middle of a heated public debate between Apple and the FBI over law enforcement’s right to ask tech companies for help with accessing encrypted data on consumer devices. The FBI won a court order from a California federal court last Tuesday directing Apple to build a new firmware that would be uploaded to Syed Farook’s iPhone to disable native security features on the device. The FBI (or Apple) could then use a computer to quickly enter thousands of passwords until it unlocked the phone.

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Apple is resisting the order, reasoning that creating such a master key would let the genie out of the bottle, and pave the way for more such requests from law enforcement.

“Law enforcement agents around the country have already said they have hundreds of iPhones they want Apple to unlock if the FBI wins this case. In the physical world, it would be the equivalent of a master key, capable of opening hundreds of millions of locks. Of course, Apple would do our best to protect that key, but in a world where all of our data is under constant threat, it would be relentlessly attacked by hackers and cybercriminals.”

Apple is expected to file an application with the California federal court this week saying that complying with the order would be “unreasonably burdensome” for the company.

The court will formally review the matter again March 22, then issue a final order.